# Questions tagged [thrust]

Any method of propulsion used by drones or model aircraft to move and fly.

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### Building a personal helicopter, I have a 5kw electric hub motor, how big will the rotors need to be? [closed]

I am building a personal electric helicopter, it consists of a lightweight steel frame that attaches to the axle of the hub motor. If the motor outputs 155nm of torque @ 5kw, and a max rpm of 700. How ...
51 views

### Error in the explanation of Ingenuity: The Mars Helicopter by NASA members?

I was watching this video by Veritasium on Youtube, where he talks with NASA engineers about the Mars helicopter. At the attached timestamp they talk about how a completely overlapping rotor ...
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1 vote
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### Would the dle 55RA be enough to power my paramotor(ducted)? [closed]

I plan on using the dle 55ra engine to produce 5hp at 8,500 rpm. I am using it in a paramotor, and to save space I am considering using a ducted propeller similar to the Fulcrum power pod. The duct ...
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462 views

### How to choose the most efficient (thrust per watt) motor+propeller setup for a drone?

I'm designing a quadcopter weighing around 250 grams, while maintaining a thrust-to-weight ratio of 2:1 Optimize: Maximize the thrust-per-watt for the motor+propeller pair Constraints: weight of each ...
1 vote
50 views

### Can an extra 300s glide upside down and backward?

I had a crasy idea; here it is. Let's say I'm flying an 80" Extra 300s with a .6 nitro motor in it. I then go into a dive straight down with full throttle util my plane is 30 ft. off the ...
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715 views

### EDF Simplified Thrust Calculation?

So I am making my own EDFs that are 3D printed. The inside volume of the tube is 412,132 cubic millimeters I believe: Inner diameter is 80mm and length was 82mm The hub diameter is: 40mm Calculated ...
834 views

### How to determine the minimum thrust to weight ratio for a fixed-wing aircraft?

I am considering building a fixed-wing aircraft with foam board, and I'm unsure what the necessary thrust to weight ratio is. With quads, it's easy to determine the necessary thrust. Just find a motor/...
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252 views

### How useful is knowing the torque generated by a motor prop combination?

I'm designing a series of small drones for use in a swarm configuration in combination with terrestrial / marine / submarine robots. As part of the process, I've designed a test rig to measure the ...
• 579
48 views

### Do propellers at different angles work the same? And do intersecting flows of air work the same?

Say a propeller pushing thrust downwards generates 70 lbs of force. If you tilted the angle of the system to 45 degrees would it generate the same thrust? If you had each rotor angled inwards of a ...
4k views

### Do propellers layered on top of each other have twice the thrust of one propeller?

If you had two of the same propellers layered on top of each other going at the same RPM, with some space in between, would the thrust be double the amount of a single propeller at the same RPM? If ...
241 views

### How do thrust requirements change as a multirotor leaves ground effect?

Assuming either a quadcopter or a hexacopter, is there any published data on how much more energy is expended to escape the ground effect? Is it a function of the thrust being produced to lift the ...
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136 views

### Datasheets for lift of a 27x12x2 inch propeller?

I'm looking to find the amount of lift produced by a 27 inch diameter, 12 inch pitch, two-blade propeller spinning facing the ground. Are there any datasheets that show the amount of lift given at any ...
894 views

### How do ducted fans impact drone performance?

There are many drones available which use ducted fans as opposed to open propellers. How does a ducted fan quadcopter differ in performance from an open-prop quadcopter? Note: the other question ...
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